Hourglass Loop Antenna : A Stealthy Performer for VHF and UHF

If you’re hunting for a high-performance antenna that doesn’t look like a metallic porcupine, the Hourglass Loop (popularized by K4ERO) is a fantastic weekend project. It is essentially two delta loops stacked and fed in-phase, resulting in a bidirectional pattern with about 5 dB of gain over a standard dipole.

Unlike a typical 1-wavelength loop, the hourglass uses a 2-wavelength wire. The crossing point in the center acts as a phasing section, forcing currents in the top and bottom horizontal segments to be in phase. This creates a narrow vertical radiation pattern that puts your signal exactly where it needs to be: on the horizon.

Hourglass Loop Antenna : A Stealthy Performer for VHF and UHF

DIY Antennas for LoRa and Meshtastic: A Complete Guide to 433, 868, and 915 MHz

LoRa radios offer incredible long-range, low-bandwidth communication—but only if your antenna is up to the task. A poor antenna can limit you to a few hundred meters, while a well-built DIY design can push past 20 km. The best part? You can build proven, high-performance antennas for just a few dollars.

This guide covers everything you need to build your own LoRa antennas for LoRa and Meshtastic 433 MHz (Europe/Asia/amateur radio), 868 MHz (EU), and 915 MHz (North America/Australia). You’ll find exact dimensions, construction tips, band-specific trade-offs, and real-world performance comparisons.

Stock antennas that ship with LoRa modules, Meshtastic nodes, and Helium Hotspots are typically tuned for minimal cost rather than maximum performance. They’re often mismatched to your specific frequency, use cheap materials, and have poorly characterized radiation patterns.

DIY Antennas for LoRa and Meshtastic: A Complete Guide to 433, 868, and 915 MHz:

Getting Started with AIS: Track Ships from Your Shack with a RTL-SDR

The Automatic Identification System (AIS) is a VHF radio-based collision-avoidance protocol that virtually every commercial, passenger, and large recreational vessel in the world is required to carry. Since 2004, the International Maritime Organization (IMO) has mandated AIS transponders on all ships of 300 GT or more engaged in international voyages, all cargo ships of 500 GT or more on domestic routes, and all passenger ships regardless of size.

Every few seconds — sometimes as often as every two seconds when a vessel is manoeuvring — its AIS transponder transmits a compact digital burst on one of two dedicated VHF channels: 161.975 MHz (Channel 87B) and 162.025 MHz (Channel 88B). That burst contains a rich data payload: MMSI number (a unique vessel ID), ship name, call sign, IMO number, vessel type, dimensions, draught, destination, navigational status, GPS position, course over ground, speed over ground, rate of turn, and more.

Getting Started with AIS: Track Ships from Your Shack with a RTL-SDR: 

Complete Guide to Budget Software Defined Radio : From $15 Dongles to Serious HF Receivers

 Software Defined Radios have quietly rewritten the rules of radio listening. What once demanded a shelf full of dedicated hardware — separate receivers for HF, VHF, UHF, satellite — now fits into a USB dongle the size of your thumb. For hobbyists and shortwave listeners working on a tight budget, that shift is nothing short of revolutionary. This guide covers the full landscape of affordable SDRs: what to buy at each price point, which software tools matter, and how to avoid the traps that catch most beginners.

Complete Guide to Budget Software Defined Radio : From $15 Dongles to Serious HF Receivers:

Simple 2M VHF Sleeve Dipole Antenna for Rapid Field Deployment

When communication matters most, having an antenna you can build quickly from available materials becomes essential. The 2-meter Sleeve dipole antenna is one of the simplest and most reliable emergency VHF antennas you can assemble directly from the end of a transmission cable. With only a short whip, a piece of copper braid and an aluminium tube for stiffness, you can create a surprisingly efficient vertical radiator for 2 meters.

Simple 2M VHF Sleeve Dipole Antenna for Rapid Field Deployment

Building the Ultimate Multiband OCF Dipole for 40m-6m

Finding a single antenna that handles multiple HF bands without a mountain of complicated traps is a challenge. While many hams reach for a standard dipole, the Off-Center Fed (OCF) design offers a much smarter way to stay active on several bands. This specific design Multiband OCF Dipole,  originally developed and tested by Rick Littlefield (W1BQT), serves as a reliable workhorse for the 40, 20, 10, and 6-meter bands.

By shifting the feed point, we tap into a “magic spot” where the antenna’s impedance stays relatively consistent across harmonically related frequencies. This makes it a perfect match for the standard 50-ohm coax found in most shacks today.

Building the Ultimate Multiband OCF Dipole for 40m-6m

Compact 80 Meter Short Dipole Antenna for Small Spaces

One of the biggest challenges in amateur radio is finding enough space for low-frequency antennas. The 80 meter band is especially demanding because a conventional half-wave dipole requires nearly 40 meters of total wire length. For many operators, that simply is not possible.

Small urban plots, limited rooftop space, nearby buildings, and lack of suitable support points often make a full-size dipole impractical. Fortunately, there are several methods for reducing antenna size without completely sacrificing performance.

This short Dipole antenna for 80 meter is one of the more interesting solutions. By using loading coils placed at carefully selected positions along each arm of the antenna, the overall length can be reduced almost by half while still maintaining respectable efficiency and usable bandwidth.

Compact 80 Meter Short Dipole Antenna for Small Spaces